regular expression question

"Gijs" <gvheurn@gmail.com>
8 Jun 2005 16:01:34 -0400

          From comp.compilers
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From: "Gijs" <gvheurn@gmail.com>
Newsgroups: comp.compilers
Date: 8 Jun 2005 16:01:34 -0400
Organization: http://groups.google.com
Keywords: lex, question
Posted-Date: 08 Jun 2005 16:01:34 EDT

Hi all,


Don't know if this is the right group for this. Can anyone tell me how
to create a regular expression that matches all except for one string?
I tried to use the complement sign ^, but this is only usable for one
character, not for a whole string.


So for example I want to have a RE that matches all strings except for
the string "hello". How do you do this?


I have the feeling this is a very dumb question, but I have no idea how
to get this.


Thanks in advance!


Gijs
[It's not a dumb question, it's a hard question. The complement of a RE
is usually not a RE. My practical advice would be to look for "hello" and
reverse the sense of the test in the surrounding code. -John]


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